Comments, with reply, on 'An exponential second-order probability-density function' by V.P. Pyati

The commenter discusses the claim by the author of the above-titled letter (ibid., vol.75, no.11, p.1548-9, Nov. 1987) that the joint probability density function (JPDF) used previously by the commenter is unrealistic in the limit of widely separated (time-series or rough-surface) points. The nature of the use of the JPDF in the physical optics integral for very-rough-surface scatter avoids the limit where this problem occurs, so the scatter results based on the commenter's model remain valid. He further observes that the exponential JPDF given by Pyati is neither simple nor easy to manipulate. Pyati presents some counterarguments.<
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