How to enter complex conductivity vs. frequency into CST

Hi,
Following the discussion here: https://www.edaboard.com/thread223918.html I obtained complex conductivity vs. frequency data of graphene material. I'm using CST and I don't know how to enter complex conductivity values in CST. I searched a lot for several days and what I concluded that I can only enter frequency dependent conductance into CST but it doesn't get complex numbers. Do you have any idea on this?
Any help is greatly appreciated. Thanks a lot.

Did you try to convert the data to complex permittivity (lossy dielectricum)?

Thanks for fast reply. I don't know how to convert to complex permittivity. Could you please help on this?

hi, i am not sure this is correct, but this is how i did it:
1)obtain graphene conductivity from kubo formula using Matlab.
2)create new material->choose type:surface impedance
3)properties->load file from matlab
*it needs three columns (frequency, resistance, and reactance)