The penetration depth for copper at 2 MHz with σ = 5.8 x 10-7 is:

Skin depth is given by

$(\delta = \frac{1}{{\sqrt {\pi f\mu \sigma } \;}})$

$(\delta = \frac{1}{{\sqrt {\pi \;\left( {\;2\;.\;{{10}^6}} \right)\left( {4\;\pi .\;{{10}^{ - 7}}} \right)\left( {{{5.8.10}^7}} \right)} \;}} = 46.72\;\mu m)$

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