E/M absorbing materials

Hi all;

i need some information about the permeattivity and permubility of Electromagnetic absorbing materials.
could you please help me on this subject.

thx.

http://www.eccosorb.com/principles/M...e_RFDesign.pdf

hello VSWR;

thank you for your guidance, i want to know how could i simulate an absorbing layer in electromagnetic simulators such as hfss. in fact when i want to draw such layer i should define its material by permeattivity, permubility, conductivity and etc. which value i should consider for them?

please.