two-waves interference patterns which add up. The cone is the Fourier transform of the spatial distribution of the intensity of the scattered light on the sample surface, when the latter is illuminated by a point-like source. The enhanced backscattering relies on the constructive interference between reverse paths. One can make an analogy with a Young's interference experiment, where two diffracting slits would be positioned in place of the "input" and "output" scatterers. See also Back scattering alignment (BSA), a coordinate system most commonly used in radar Forward Scattering Alignment (FSA), a coordinate system primarily used in optics Opposition surge An astronomical phenomenon caused by the coherent backscatter effect References Scattering, absorption and radiative transfer (optics) Mesoscopic physics