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The results of detailed investigations of the conductivity and Hall effect in gated single-quantum-well GaAs/InGaAs/GaAs heterostructures with two-dimensional electron gas are presented. A successive analysis of the data has shown that the conductivity is diffusive for kFl=25-2. The absolute value of the quantum corrections for kFl=2 at low temperature is not small; e.g., it is about 70% of the Drude conductivity at T=0.46K. For kFl=2--0.5 the conductivity looks like the diffusive one. The temperature and magnetic field dependences are qualitatively described within the framework of the self-consistent theory of Vollhardt and W\"olfle. The interference correction is therewith close in magnitude to the Drude conductivity so that the conductivity σ becomes significantly less than e²/h. We conclude that the temperature and magnetic field dependences of the conductivity in the whole kFl range are due to changes of the quantum corrections.
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Minkov et al. (2002) studied this question.
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