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Caution Fill in all input cells. Choose all parameters unit. The direction of observation is in the incidence plane defined by the incident direction and the normal to the surface.
The reflectivity Ref is between 0 and 1 in SI units. All angles are positive except teta which can be either positive or negative. It is positive if the angle between the observation direction and the normal to the diffusing surface is larger than the angle i and negative otherwise
