Comment on "Magnetic Breakdown at High Fields: Semiclassical and Quantum   Treatments"
  We comment on the study of the spin-damping factor on the de Haas-van Alphen (dHvA) discussed by Han et al. (Phys. Rev. Lett. 85, 1500 (2000)). 
Keita Kishigi and Yasumasa Hasegawa