Temperature dependence of the bandwidth of delocalized states for n-InGaAs/GaAs in the quantum Hall effect regime Low Temp. Phys. 39, 50 (2013); 10.1063/1.4775752 Insulator-quantum Hall conductor transition in high electron density gated InGaAs/InAlAs quantum wells J. Appl. Phys. 108, 063701 (2010); 10.1063/1.3486081Magnetotransport in two-dimensional n -In Ga As ∕ Ga As double-quantum-well structures near the transition from the insulator to the quantum Hall effect regime Low Temp.The longitudinal q xx (B,T) and Hall q xy (B,T) magnetoresistances in n-InGaAs/GaAs heterostructures with a single quantum well are studied experimentally before and after IR illumination in the quantum Hall regime in magnetic fields B ¼ 0-12 T and at temperatures T ¼ 0.4-4.2 K. The temperature dependence of the width of quantum Hall plateau-plateau transitions is analyzed in terms of a twoparameter scaling theory. V C 2015 AIP Publishing LLC. [http://dx.