  Magneto-transport measurements are performed on two-dimensional GaAs electron
systems to probe the quantum Hall (QH) effect at low magnetic fields.
Oscillations following the Shubnikov-de Haas (SdH) formula are observed in the
transition from the insulator to QH liquid when the observed almost
temperature-independent Hall slope indicates insignificant interaction
correction. Our study shows that the existence of SdH oscillations in such a
transition can be understood based on the non-interacting model.
