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How is surface current calculated?

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supernano

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EM simulation software (e.g. CST-MWS), can calculate the current on the surface of conductors from the magnetic field solutions. Does anyone know how this current is calculated and what is it's meaning?
In a coaxial cable, for example, is that surface current all the current that flows through the conductors? Or is there current flowing through the bulk of the conductors as well?

I'm having a bit of trouble getting my head around these concepts. Thanks for your help.

---------- Post added at 15:50 ---------- Previous post was at 14:49 ----------

After some reading, I understand now that in a perfect conductor the fields are zero inside the region, so n.B=0 and nxH=J. That will be the surface current.
I have a new question though. CST-MWS calculates surface currents for lossy conductors as well. Does anyone know if this is only the current at the surface or the sum of current along the skin-depth?
 

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