values of the parameters & that are
part of Equation (14) in
section 3.4.20.
RMS_SMALL
surface roughness of small angle scatter
CORLEN_SMALL
correlation length of small angle scatter
RMS_LARGE
surface roughness of large angle scatter; this
is provided for completeness only. With the current knwoledge of the
calibration, the values provided by function rgsGetLAScatterRoughness (section 3.4.18)
should be used.