The radar cross section (RCS) of a 2D object is calculated by:

Dividing the object into many small segments (facets)
Calculating the reflection coefficient of each facet (depends on material/angle of incidence)
Summing the contributions of each facet

So in code it would look something like:
```python
total_rcs = 0
for facet in facets:
    rcs_contribution = facet_area * reflection_coeff(facet_material, facet_angle)
    total_rcs += rcs_contribution
```
The material will affect the reflection coefficient - a perfect conductor will reflect all energy and have a reflection coefficient of 1, while absorptive/transmissive materials will have a lower reflection coefficient.
The angles of the facets will also matter a lot - at glancing angles there is less reflection, and at normal incidence there is maximum reflection (for a given material).
So to fully calculate the RCS, you need to properly account for:

Materials
Angles of each facet
Proper summation of all facets
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