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Taking into account the interaction of an electron with both bulk longitudinal-optical and interface-optical (IO) phonons, the cyclotron resonance of a rnagnetopolaron in quasi-twodimensional systems at finite temperatures is investigated by using the generalized Larsen perturbation-theory method. It is shown that the absorption and emission resonance must be considered at the same time at finite temperatures. The results also show the important role played by the electron -IO-phonon interaction. For a magnetopolaron at the interface of the GaAs/GaSb structure and ih a GaAs/Ga& Al As quantum-well structure, the splitting of the cyclotronresonance spectrum and the temperature dependence of the splitting of the cyclotron-resonance mass of a magnetopolaron in the resonant-magnetic-field region have been studied.

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