  Shubnikov-de Haas (SdH) oscillations and magneto-intersubband oscillations of
magnetoresistance of structures with single HgTe quantum wells with a width of
(10-18) nm have been experimentally studied. The spectrum of the conduction
band in these structures is split by the spin-orbit interaction. This leads to
beats of the SdH oscillations and the appearance of low-frequency
magneto-intersubband oscillations. The mutual position of the antinodes of the
SdH oscillations and the maxima of the magneto-interband oscillations is
unusual -- in low magnetic fields it is directly opposite to the predictions of
the theory. Measurements in high magnetic fields, in which the relative
amplitude of the SdH oscillations becomes greater than 0.2-0.3, show a change
in the relative position of the antinodes of the SdH oscillations and the
maxima of low-frequency oscillations. Numerical calculations and additional
measurements at different temperatures show that the observed effects are due
to oscillations of the Fermi level in the magnetic field.
