In the past few years several papers have been published on the z-transform approach to the problem of seismic wave propagation in layered media. Although these papers start with the same fundamental equations, small differences in notation make the study of the synthetic seismograms derived in these papers time consuming. In order to aid the reader, the present note gives the basic equations as well as tables which show the correspondence for the main symbols used in the papers of Goupillaud (1961), Kunetz (1964) Sherwood and Trorey (1965), Treitel and Robinson (1966), Robinson (1967), and Claerbout (1968).

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