“…This problem is readily solved by the quantum treatment of transverse particle motion [25,26], being, however, both really necessary and practically feasible only at the electron and positron energies of a few dozen MeV and less. However, most of the current investigations are conducted at GeV [13,14,27] and higher [1][2][3][4][5][6][7][8][9][10][15][16][17][28][29][30][31][32][33][34] energies, at which the quantum description of particle motion in the averaged crystal field becomes both redundant and cumbersome, revealing the necessity for the introduction of classical particle motion features into the treatment of their incoherent scattering by the inhomogeneously distributed nuclei. Till now, a redefinition of the scattering impact parameter upper limit R → u 1 [28][29][30][31]35] has been used, which did not take into consideration any incoherent scattering dependence on the transverse particle coordinate, giving, thus, a qualitative estimate only.…”