Rayleigh phase function (rayleigh_polarized)

Parameter	Type	Description	Flags
depolarization	float	Depolarization factor, the ratio of intensities parallel and perpendicular to the plane of scattering for light scattered at 90 deg.

Scattering by particles that are much smaller than the wavelength of light (e.g. individual molecules in the atmosphere) is well-approximated by the Rayleigh phase function.