The adiabatic potential in the layer semiconductor GaSe is considered taking into account the Davydov splitting of the bands. It is shown that in the case of electron-phonon interaction which is responsible for the Jahn-Teller pseudoeffect, distortions are possible either normal to layers or along the layers, depending on the parameters of the electron and phonon subsystems.PaccMaTpHsaeTcn aAEla6aTMWCKHB noTeHqHan B CJIOE~CTOM nonynpoBoHHElHe GaSe c yre-roM HasbinoBcnoro pacWenJreHmf OH. I l o~a 3 a~0 , TO B caysae a n e~~p o~-x o n e6aTeJIbHOI' O B3aHMOAeBCTBHfi, OTBeTCTBeHHOrO 38 IICeBnO3@$eKT %Ia-Tennepa, B 3aBIICM-MOCTH OT napaMeTpOB paCCMaTpHBaeM08 CEl CTeMbI B03MOlfEHbI AEl CTOpCMIl am60 BHOJlb HopMam K CJIORM, a2160 B A O~~ cnoeB.

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