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In the work it was shown that the In₄Se₃ crystal is similar by its dynamical\udproperties to the InSe modulated crystal. The transformation of the D⁴₆h symmetry group of β-InSe crystal to D⁹₂h group of the In₄Se₃  structure\udand the D¹²₂h group of In₄Se₃ structure has been investigated. In spite of\udstructure corrugation of In₄Se₃ layer, it is shown that the region of the weak\udbond in this crystal by the dynamical characteristics is similar to the weak\udbond region in InSe crystal.У роботі показано, що кристал In₄Se₃ за своїми динамічними властивостями близький до модульованого кристалу InSe. Досліджено перетворення групи симетрії D⁴₆h кристалу β-InSe до групи D⁹₂h структури In₄Se₄ і до групи D¹²₂h In₄Se₃. Показано, що незважаючи на гофрованість структури шару In₄Se₃, область слабкого зв’язку у ньому за\udдинамічними властивостями є подібною до області слабкого зв’язку\udу кристалі InSe

STRUCTURE SIMILARITY AND LATTICE DYNAMICS OF InSe AND In_4Se_3 CRYSTALS