Complementary (homogeneous) transient solutions for orthotropic thermoelasticity with thermal relaxation admit plane waves that propagate in a principal plane without spatial attenuation, but with exponential decay in their wake. Three speeds that vary with decay coefficient and propagation direction exist, and each speed is associated with three reflections from a plane surface aligned with another principal plane. As examples, values from both speed sets are presented, as well as angles of reflection and decay coefficients for given incident waves. For a half-space surface that is traction-free but exhibits convection, surface temperature change is derived, and values also presented.

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