Roy. as you know, radio propagation through the ground follows exactly
the same laws as propagation through anything else.
All is governed by the resistivity, permeability and permittivity of
the medium, at a partcular frequency, and the geometry of the
interfaces between different mediums.
The problem of finding solutions to paricular problems lies only in
entering input data into a general purpose, number crunching computer
program, which I'm sure versions of it already exist.
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