Integer quantum Hall effect

On an ideal integer plateau, the magnitude of transverse sheet conductivity is $N{e}^2/h$, where $N$ is a positive integer, while the longitudinal sheet conductivity vanishes. The measured transverse electrical resistance is then $h/(N{e}^2)$. Both statements matter: inverting a conductivity tensor mixes its longitudinal and transverse components, as the quantum Hall conductivity tensor inversion shows.