What is the expected mix of lagging-edge and IoT tools in the systems business for 2021 
dry -- leading foundry, we've seen a tremendous ramp of that new optical wafer inspection system. And it really gives the customers tremendous performance at a much better cost of ownership so they can insert inspection points in more places in the line, and that has a big impact on the speed of the yield ramp. So that's really in the early phase of adoption, the new optical wafer inspection system. Our e-beam products are tremendously strong.
If you look at a 2021, our e-beam growth would exceed every prior year for PDC total systems business other than 2020. So that business is very strong. We have leadership in electron optics. We've introduced a new source technology that gives us much higher resolution, much faster imaging in one segment of the EB market.
We will take that core technology in electron optics across all of our different platforms, and it creates just a tremendous opportunity for us to continue to extend our leadership in the e-beam part of the market. So that's growing very fast. And the third thing I would say that's really important, when you think about power performance area and cost, what's really important to our customers is how fast they can drive all of those different key metrics. So accelerating, certainly for us and for them, we talk about PPACt, is enormously important.
And there are cases with the -- especially our e-beam products where you can generate orders of magnitude more data in a much faster period of time. So when you're thinking about optimizing the new materials, the new structures with unique imaging and algorithms to accelerate both our internal R&D at Applied and also the PPAC road map for our customers, that synergy is increasing from an overall company perspective. So again, I think the optical inspection, we're in the early phase of the adoption. E-beam, leadership in imaging.
We'll extend that leadership with new capabilities. And the synergies with our overall business has never been better and never been more important for us and for our customers.
Operator
Thank you. Our next question comes from the line of Harlan Sur with J.P. Morgan. Your line is now open.
Harlan Sur -- J.P. Morgan -- Analyst
Good afternoon, and great job on the quarterly execution. The chip shortages in the industry are across leading-edge and lagging-edge technologies, probably more so on lagging edge, just to support analog, mixed signal, microcontroller products that feed into the auto and industrial markets. And I think these customers are scrambling to add capacity. What's order activity been like for lagging-edge tools? And it looks like lagging edge and IoT contributed about 25% of your systems business last year.
Do you guys expect that mix to grow this year? And how do operating margins for these tools compare to the overall systems segment?
Dan Durn -- Chief Financial Officer
Yeah. Thanks, Harlan, let me just pull up some statistics on the split. So trailing node versus leading edge this year, we kind of see -- if it was maybe -- yeah, probably a follow-through on 70-30 again this year: 70% leading edge, 30% trailing node geometries. As we go back in time, we've been talking about this a fair amount here over the last couple of years.
So strength on the trailing-node geometries is -- has not been new. In fact, if we go back 2010 to 2020, take that 10-year window, if the foundry business over that time, in aggregate, grew just about 90% a little bit less, the trailing-node geometries have been above the foundry segment average at about just over 110% growth. Leading edge has grown at about just over 75%, so this trend has been playing out for quite some time. We're well-positioned in this segment.
We're delivering key technologies, and the company is performing well. This will be very value accretive to us as this segment of the market continues to grow and outgrow WFE.
Gary Dickerson -- President and Chief Executive Officer
Yeah. Harlan, I can add just maybe a little bit to this. I think this opportunity in what people refer to as specialty semiconductor is significant. About two years a
dry -- leading foundry, we've seen a tremendous ramp of that new optical wafer inspection system. And it really gives the customers tremendous performance at a much better cost of ownership so they can insert inspection points in more places in the line, and that has a big impact on the speed of the yield ramp. So that's really in the early phase of adoption, the new optical wafer inspection system. Our e-beam products are tremendously strong.
If you look at a 2021, our e-beam growth would exceed every prior year for PDC total systems business other than 2020. So that business is very strong. We have leadership in electron optics. We've introduced a new source technology that gives us much higher resolution, much faster imaging in one segment of the EB market.
We will take that core technology in electron optics across all of our different platforms, and it creates just a tremendous opportunity for us to continue to extend our leadership in the e-beam part of the market. So that's growing very fast. And the third thing I would say that's really important, when you think about power performance area and cost, what's really important to our customers is how fast they can drive all of those different key metrics. So accelerating, certainly for us and for them, we talk about PPACt, is enormously important.
And there are cases with the -- especially our e-beam products where you can generate orders of magnitude more data in a much faster period of time. So when you're thinking about optimizing the new materials, the new structures with unique imaging and algorithms to accelerate both our internal R&D at Applied and also the PPAC road map for our customers, that synergy is increasing from an overall company perspective. So again, I think the optical inspection, we're in the early phase of the adoption. E-beam, leadership in imaging.
We'll extend that leadership with new capabilities. And the synergies with our overall business has never been better and never been more important for us and for our customers.
Operator
Thank you. Our next question comes from the line of Harlan Sur with J.P. Morgan. Your line is now open.
Harlan Sur -- J.P. Morgan -- Analyst
 Good afternoon, and great job on the quarterly execution. The chip shortages in the industry are across leading-edge and lagging-edge technologies, probably more so on lagging edge, just to support analog, mixed signal, microcontroller products that feed into the auto and industrial markets. And I think these customers are scrambling to add capacity. What's order activity been like for lagging-edge tools? And it looks like lagging edge and IoT contributed about 25% of your systems business last year.
Do you guys expect that mix to grow this year? And how do operating margins for these tools compare to the overall systems segment?
Dan Durn -- Chief Financial Officer
Yeah. Thanks, Harlan, let me just pull up some statistics on the split. So trailing node versus leading edge this year, we kind of see -- if it was maybe -- yeah, probably a follow-through on 70-30 again this year: 70% leading edge, 30% trailing node geometries. As we go back in time, we've been talking about this a fair amount here over the last couple of years.
So strength on the trailing-node geometries is -- has not been new. In fact, if we go back 2010 to 2020, take that 10-year window, if the foundry business over that time, in aggregate, grew just about 90% a little bit less, the trailing-node geometries have been above the foundry segment average at about just over 110% growth. Leading edge has grown at about just over 75%, so this trend has been playing out for quite some time. We're well-positioned in this segment.
We're delivering key technologies, and the company is performing well. This will be very value accretive to us as this segment of the market continues to grow and outgrow WFE.
Gary Dickerson -- President and Chief Executive Officer
Yeah. Harlan, I can add just maybe a little bit to this. I think this opportunity in what people refer to as specialty semiconductor is significant. About two years a