The results of the electronic structure calculations made in the large-unit-cell complete neglect of differential overlap approach are given for the crystals MF₂ (M=Ca, Sr, Ba, Cd, Pb or Sn) and PbSnF₄. The same approach is used for the impurity centre MF₂:Cd (M=Ca, Sr, Ba and Pb) and the lattice distortion introduced by the symmetrical shift of the nearest cation neighbour. It is shown that the influence on the band structure of this lattice distortion is not large.