  Field-, temperature- and angle-dependent Fourier amplitude of de Haas-van
Alphen (dHvA) oscillations are calculated for compensated two-dimensional (2D)
metals with textbook Fermi surface (FS) composed of one hole and two electron
orbits connected by magnetic breakdown. It is demonstrated that, taking into
account the opposite sign of electron and hole orbits, a given Fourier
component involves combination of several orbits, the contribution of which
must be included in the calculations. Such FS is observed in the strongly 2D
organic metal alpha-'pseudo-kappa'-(ET)4H3O[Fe(C2O4)3].(C6H4Br2), dHvA
oscillations of which have been studied up to 55 T for various directions of
the magnetic field with respect to the conducting plane. Calculations are in
good quantitative agreement with the data.
