With reference to the treatment contained in a recent paper [ J. Opt. Soc. Am. A 3, 550 ( 1986)], the regions of validity of the energy method of Renard for obtaining the Goos–Hänchen lateral shift are discussed, and the proper procedure for implementation of the energy method, including the interaction power flow introduced by Yasumoto and Ōishi [ J. Appl. Phys. 54, 2170 ( 1983)], is described.
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