Editing Skin effect (section)

== Electromagnetic waves ==
{{see also|Penetration depth}}
In electromagnetic waves, the skin depth is the depth at which the amplitude of the electric and magnetic fields have reduced by <math>\frac{1}{e}</math>.<ref>{{harvtxt|Jackson|1999|page=353}}</ref> The intensity of the wave is proportional to the square of the amplitude, and thus the depth at which the intensity has diminished by <math>\frac{1}{e}</math> is <math>\frac{\delta}2.</math> In [[waveguides]], losses due to induced currents occur mostly within one skin depth of the surface. Thus, plating the surface of a waveguide with a material which has a low skin depth reduces losses.<ref>{{harvtxt|Feynman|1964|page=32-11}}</ref>