Interference phenomena in radiation of a charged particle moving in a   system with one-dimensional randomness
  The contribution of interference effects to the radiation of a charged particle moving in a medium of randomly spaced plates is considered. In the angular dependent radiation intensity a peak appears at angles $\theta\sim\pi-\gamma^{-1}$, where $\gamma$ is the Lorentz factor of the charged particle. 
Zh.S. Gevorkian and Th.M. Nieuwenhuizen