The well-known equation is for skin depth given below. Note that skin depth
(δ) is a function of only three variables, frequency (ƒ), resistivity
(ρ), and relative permeability (μR).
Where;
δ = the skin depth in metres
ρ = the resistivity of the medium in ohm-meter,
ƒ = the frequency of the current in Hz,
μR = the relative permeability of the medium,
μ0 = Permeability constant (Henries/meter) = 4π*10-7H/m
The skin depths of some common metals at a frequency of 10�GHz (microwave region) are less than a micron:
