We reveal that the recently discovered specular Andreev reflection (SAR) [C. W. J. Beenakker, Phys.
Rev. Lett. 97, 067007 (2006)] can occur in semiconductors where the spin-orbit coupling is finite. We
demonstrate this finding in the hybrid of a two-dimensional electron gas with Rashba spin-orbit coupling
and a superconductor. In the limit of low density or a strong spin-orbit coupling, specular Andreev
reflection is finite. We also show that unit electron-hole conversion is possible in a specular Andreev
reflection due to the different topological structures of the equal-energy surface between electrons and
holes. The SAR in the semiconductor is determined by the relative orientation of wave vector to group
velocity, which can be analyzed by ray equations.