Organized Current Patterns in Disordered Conductors
  We present a general theory of current deviations in straight current carrying wires with random imperfections, which quantitatively explains the recent observations of organized patterns of magnetic field corrugations above micron-scale evaporated wires. These patterns originate from the most efficient electron scattering by Fourier components of the wire imperfections with wavefronts along the $\pm 45^{\circ}$ direction. We show that long range effects of surface or bulk corrugations are suppressed for narrow wires or wires having an electrically anisotropic resistivity. 
Y. Japha, O. Entin-Wohlman, T. David, R. Salem, S. Aigner, J.   Schmiedmayer, R. Folman