Comment on ``New Class of Resonances at the Edge of the Two-Dimensional   Electron Gas.''
  A reproducible resonance structure in the conductance through an incompressible strip in the quantized Hall regime was recently reported by Zhitenev {\it et al}. Although the authors disfavored the explanation of the conductance resonances based on resonant tunneling (RT) through an impurity state, I believe that it should not be dismissed and can explain a number of experimental observations very well. In particular, I point out a new characteristic signature of RT in the quantized Hall regime: the quantization of the slopes of the resonance tracks on the magnetic field-gate voltage plot. 
Dmitri B. Chklovskii