NEC-LIST: Inserting patches in NEC

I'm an italian student of Engineering of
Telecommunications
I'm using NEC in my graduation thesis.

I have to insert a building near the antenna to
simulate the behaviour of
the
electromagnetic field. I think that I should use the
surface options to
create
the walls of the house but I'm not sure and I cannot
do that!
- Where can I find an example of code used in this
case?
- How can I choose the material of the wall?

Please help me as soon as possible!!!

Best regards
Aieie Brazo

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