edge of the circuit board in this example all of the layers of the circuit board are slotted at the edge of the circuit board a slot 116 c 112 c and 114 c is formed in insulating layer 116 conductive layer 112 and conductive layer 114 respectively the slot runs through all of the layers of the circuit board including the layers that are not shown and the layers that are not numbered slots 116 c 112 c and 114 c are smaller in both the x and y direction than the gaps 112 a and 114 a in conductive layers 112 and 114 thus the gaps 112 a and 114 a extend laterally i e in the x direction on either side of slots 112 c and 114 c the gaps 112 a and 114 a also extend deeper i e in the y direction than slots 112 c and 114 c thus the slots are formed within the gaps and are completely surrounded by the gaps as with the previous examples of fig5 a and 5 b any deformation 160 a that may occur will fall into gaps 112 a and 114 a rather than make contact with edge portions 112 b or 114 b of conductive layers 112 and 114 thus short circuiting is avoided there can be many different variations in the geometry of the edge and in particular the slots 116 112 and 114 so long the gaps in the conductive.