  We show that electron wave functions in a quasi-two-dimensional conductor in
a parallel magnetic field are always localized on conducting layers. Wave
functions and electron spectrum in a quantum limit, where the "sizes" of
quasi-classical electron orbits are of the order of nano-scale distances
between the layers, are determined. AC infrared measurements to investigate
Fermi surfaces and to test Fermi liquid theory in Q2D organic and high-Tc
materials in high magnetic fields, H = 10-45 T, are suggested.
