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Variance of unitary RCS in the small perturbation theory's valid field

The scattered intensity from rough random surface with known statistical properties is a random process. The scattering coefficient is used to estimate the scattered average power of this random process. To describe this process fully, more parameters such as the variance are needed. This paper extends previous work on the variance of unitary RCS at the first order small perturbation theory's valid regions. A numerical simulation with the rough random surface generated by digital computer is performed to investigate its general validity.