I am looking for references about material which are used for EMI shielding in industry and their EMI shielding effectiveness in a certain frequency range.
I read a lot of paper about composite materials based on polymer matrix and conductive fillers for EMI shielding. There are a lot of data but I want to compare it with metal shields (made of steel, Cu, alloys etc.) because I think that metal shields the best for protection EMI, of course they have disadvantages. So, to compare with metal shields I should find official data, but I can not, because it is not reported in the literature.