  In the present paper we study magneto-intersubband oscillations (MISO) in
HgTe/Hg$_{1-x}$Cd$_x$Te single quantum well with "inverted" and "normal"
spectra and in conventional In$_{1-x}$Ga$_x$As/In$_{1-y}$Al$_y$As quantum wells
with normal band ordering. For all the cases when two branches of the spectrum
arise due to spin-orbit splitting, the mutual arrangement of the antinodes of
the Shubnikov-de Haas oscillations and the maxima of MISO occurs opposite to
that observed in double quantum wells and in wide quantum wells with two
subbands occupied and does not agree with the theoretical predictions. A "toy"
model is supposed that explain qualitatively this unusual result.
