At 3 times the standard depth of skin depth the density is 5 percent
of that on the surface, below which only copper losses with respect to
a time varying current. So what exactly forces a time varying current
to take an alternate route of travel from the center of a conductor
when the resistance is so low compared to other routes that could be
taken.?
Note : center resistance is lower than that on the surface because
skin depth (opposing eddy currents) cannot form.
Art