  The Zeeman splitting of the conduction band in the HgTe quantum wells both
with normal and inverted spectrum has been studied experimentally in a wide
electron density range. The simultaneous analysis of the SdH oscillations in
low magnetic fields at different tilt angles and of the shape of the
oscillations in moderate magnetic fields gives a possibility to find the ratio
of the Zeeman splitting to the orbital one and anisotropy of g-factor. It is
shown that the ratios of the Zeeman splitting to the orbital one are close to
each other for both types of structures, with a normal and inverted spectrum
and they are close enough to the values calculated within kP method. In
contrast, the values of g-factor anisotropy in the structures with normal and
inverted spectra is strongly different and for both cases differs significantly
from the calculated ones. We believe that such disagreement with calculations
is a result of the interface inversion asymmetry in the HgTe quantum well,
which is not taken into account in the kP calculations.
