Skin Depth -- from Eric Weisstein's World of Physics

Electromagnetism "> Electric Fields v

Electromagnetism "> Electromagnetic Waves v

Skin Depth

The skin depth of a substance is the distance to which incident electromagnetic radiation penetrates. In cgs,

where H is the magnetic field in matter, B is the magnetic field, is the permeability, c is the speed of light, J is the volume current, D is the electric field in matter, is the electrical conductivity, and is the electric field.