## dissymmetry of scattering

https://doi.org/10.1351/goldbook.D01808
The ratio of two Rayleigh ratios for different angles of observation, i.e. $z(\theta _{1},\, \theta _{2}) = \frac{R(\theta _{1})}{R(\theta _{2})}$ $\theta _{1} < \theta _{2}$ The angles must be specified; in @L03525@ it is customary to let $$\theta = 1 - \theta _{1}$$ and, most frequently, $$\theta _{1} = 45 ^{\circ}$$ and $$\theta _{2} = 135 ^{\circ}$$.
Source:
Purple Book, 1st ed., p. 67 [Terms] [Book]