The form of the K-M solution originally was: F(R_\infty)\equiv \frac{(1-R_\infty)^2}{2R_\infty} = \frac {a_0}{r_0} , but it was rewritten in terms of linear coefficients by some authors, becoming F(R_\infty)\equiv\frac{(1-R_\infty)^2}{2R_\infty} = \frac {k}{s} , taking k and s as being equivalent to the linear absorption and scattering coefficients as they appear in the Bouguer-Lambert law, even though sources who derived the equations preferred the symbolism \frac {K}S and usually emphasized that K=2k and S was a remission or back-scattering parameter, which for the case of diffuse scatter should properly be taken as an integral.
