The　model　of　the　equations　of　generalized　magneto-thermo-elasticity　based　on　Lord-Shulman　theory　(LS)　with　one　relaxation　time,　Green-Lindsay　theory　(GL)　with　two　relaxation　times,　as　well　as　the　classical　dynamical　coupled　theory　(CD),　is　used　to　study　the　electro-magneto-thermo-elastic　interactions　in　a　semi-infinite　perfectly　conducting　solid.　The　entire　elastic　medium　is　rotating　with　a　uniform　angular　velocity.　There　an　initial　magnetic　field　acts　parallel　to　the　plane　boundary　of　the　half-space.　Reflection　of　magneto-thermo-elastic　waves　under　generalized　thermoelasticity　theory　is　employed　to　study　the　reflection　of　plane　harmonic　waves　from　a　semi-infinite　rotating　elastic　solid　in　a　vacuum.　The　expressions　for　the　reflection　coefficients,　which　are　the　relations　of　the　amplitudes　of　the　reflected　waves　to　the　amplitude　of　the　incident　waves,　are　obtained.　Similarly,　the　reflection　coefficients　ratios　variation　with　the　angle　of　incident　under　different　conditions　are　shown　graphically.　Comparisons　are　made　with　the　results　predicted　by　the　three　theories　in　the　presence　and　absence　of　rotation.　©　Technical　University　of　Lodz.