We report detailed observations of the propagation of third sound in ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ mixture films as a function of temperature and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ concentration. The data are consistent with a simple model for the film and we conclude that thin ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ mixture films exhibit nearly complete phase separation.

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