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In this paper we analyse the dispersion of the normal propagation modes of a liquid bilayer in terms of the dispersion in the constituent layers with the proper boundary conditions. The analysis is done in the framework of an acoustic raymodel which leads to a transparent form of the dispersion relation. Although a liquid bilayer is of no direct practical use, the data analysis will prove to be of great help when studying solid multilayers. Rttsumtt Dans cet article nous analysons la dispersiondoi:10.1121/1.403960 fatcat:4gghjrqmszdiveuulgvuvsecta