i need an URGENT help in HFSS!

Hi,

I want to simulate backscattering RCS of a conducting thin metal plate in HFSS. I could not find enough information like pdfs, example projects etc. So can you help me with a document or answering my question?

First of all, I drew the plate and and sphere which is the mesh termination surface that we have to assign radiation boundary on it. As an excitation I chose incident plane wave on origin with phi and tetha as 0. Because I learned that this is a mono static RCS problem and when doing simulation for mono you don't have to specify anything in incident wave because simply it doesn't care..Is it true? After this point, I don't know anything that I can do to get RCS vs tetha angle plot.

Can you help me please?
Thanks in advance