  Exact expressions for the parameters of Stevens Hamiltonian are derived
within the framework of a specific model that assumes uniform character of
charge density distribution in a certain direction over crystalline lattice.
The new model is developed to strengthen the possibilities for analysis of
experimental data obtained by inelastic neutron scattering. It is particularly
valuable for studying the charge distribution in the layered perovskite-like
compounds doped with the rare-earth ions being used as a local probe.
