Second order interference of chaotic light reflected from random medium
  We consider the reflection from a random medium of light with short coherence length. We found that the second order correlation function of light can have a peak in a direction where the reflection angle is equal to angle of incidence. This occurs when the size of the region, from which light is collected, is larger than the coherence length. 
A. Yu. Zyuzin
cond-mat.mes-hall