This module computes the backscattering coefficient,
for a given periodic sinusoidal surface,
with a random smaller-scale component, using the I2
Various parameters of the sinusoidal rough surface can be specified, such as the
dielectric constant ϵ
the type of correlation function, the parameters of the
correlation function, the parameters of the sinusoidal function,
and the azimuth angle.
The model is constrained to realistic surfaces with ( rms height /
correlation length ) ≤ 0.25 and ( amplitude / period ) ≤ 1/20.
Azimuth angle = 0 corresponds to look direction parallel to the rows.