Hi, thanks for posting your questions. a dispersive permittivity can only be set for a sampled 3D material. In the conductive 3D material model, the resulting permittivity is frequency dependent according to the formula (taken from the documentation)
The question is whether this really corresponds to the material properties you are looking for. Unless you're dealing with a 2D material (where the thickness is much smaller than the wavelength), I don't think using a 2D conductivity model would work.
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