The quantity
appearing in the expression for radio absorption length, where is the electrical conductivity, is the dielectric constant, and is the frequency. The loss tangent is roughly wavelength independent.
On the surface of Mars, Rudy (1987) gives values of
Electrical Conductivity, Radio Absorption Length
References
Rudy, D. J. Mars: High Resolution VLA Observations at Wavelengths of 2 and 6 cm and Derived Properties. Ph.D. thesis. Pasadena, CA: California Institute of Technology, 1987.
