A question about the correct boundary conditions

Hi

I'm currently modeling a microwave oven. Inside the chamber is a titanium cylinder, surrounded by a susceptor in zinc oxyde. All of this is surounded by a stationary TE10 wave.

I was wondering what boundary condition I should be placing on my titanium layer. I've currently chosen a scattering boundary, but I'm not sure if it's the right one or if I've set it up correctly. Any thoughts would be greatly appreciated.

Regards,

Greg Satre