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The governing equations of rotating thermoelastic solid with diffusion are solved in context of Green-Naghdi theory (Type II) to show the numerical existence of four coupled plane waves.The required boundary conditions at stress free and thermally insulated surface of the model are satisfied to obtain the reflection coefficients of various reflected waves for an incident plane wave. These coefficients are found to depend on rotation parameter, the angle of incidence of striking wave, thermo-diffusion parameters and other material constants. Complex absolute values of speeds and reflection coefficients are computed for a particular material representing the model. Graphical representation of numerical results show the effects of rotation and diffusion on speed and reflection coefficients of plane waves.

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