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Oscillations of the real component of AC conductivity $\sigma_1$ in amagnetic field were measured in the n-AlGaAs/GaAs structure with a wide (75 nm)quantum well by contactless acoustic methods at $T$=(20-500)~mK. In a widequantum well, the electronic band structure is associated with the two-subbandelectron spectrum, namely the symmetric (S) and antisymmetric (AS) subbandsformed due to electrostatic repulsion of electrons. A change of theoscillations amplitude in tilted magnetic field observed in the experimentsoccurs due to crossings of Landau levels of different subbands (S and AS) atthe Fermi level. The theory developed in this work shows that these crossingsare caused by the difference in the cyclotron energies in the S and AS subbandsinduced by the in-plane magnetic field.

Electronic band structure in $n$-type GaAs/AlGaAs wide quantum wells in tilted magnetic field