The statistical weight W as a function of energy E for quasielectrons with mass m* subject to a fixed magnetic field B is
, where A is the sample area, and ωc ≡ eB/m* the cyclotron frequency. Significantly, there is no Landau term proportional to B2 in 2D. This leads to the conclusion that the 2D electron system is always paramagnetic, but shows a magnetic oscillation.