Comment on "High Field Quasiparticle Tunneling in   Bi_2Sr_2CaCu_2O_{8+\delta} : Negative Magnetoresistance in the   Superconducting State" (N.Morozov et al, Phys.Rev. Lett. 84,1784 (2000))
  We show that the negative c-axis magnetoresistance in cuprates is the normal state feature. 
V.N. Zavaritsky (Kapitza Institute for Physical problems, Moscow,   Russia), M. Springford (H.H. Wills Physics Laboratory, U...