Abstract
The two‐variable expansion technique is used to solve for the mean Green's functions from the Dyson equation under the nonlinear approximation for a half‐space random medium with three‐dimensional correlation functions. The Bethe‐Salpeter equations are then solved under the ladder approximation. The radiative transfer equations, which have been applied extensively in the study of microwave remote sensing problems, are derived under these approximations. The limiting cases of large and small horizontal correlation lengths are discussed. It is found that there is only one propagation constant except for the case of large horizontal correlation lengths, in which there are two propagation constants. We also show that boundary layer appears in first‐order solutions and does not appear in zeroth‐order solutions.
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