Highly disordered two-dimensional electron system in a weak magnetic field

The highly disordered two-dimensional electron gas contained in multi-delta -layers was experimentally investigated by a magnetotransport method to obt ain information about the nature of electron states in the range of weak ma gnetic fields. The data observed have been found to be in conflict with the widely accepted floating of the extended states at vanishing magnetic fiel ds and we have suggested an alternative interpretation of the data as a dir ect transition from an integral quantum Hall liquid to a two-dimensional di sordered conductor with the transport controlled by weakly localized states .