I'm developing a type of enclosure that provides EMR shielding. It's constructed of two layers of shielding material. I don't have access to professional test equipment, so my dynamic range is limited. Therefore, I'm only able to measure the attenuation of a single layer of material to any degree of confidence. With two layers, the shielded signal strength is at or below the noise floor. Is there a formula for estimating overall attenuation given two layers of material of known attenuation?

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    \$\begingroup\$ Down load a student edition of quickfield (or similar) and simulate it. It utterly depends on frequency of course; low frequencies can pass virtually unhindered as a magnetic field. \$\endgroup\$ – Andy aka Feb 11 '18 at 16:25

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