The URL was a bit difficult to track down, so I will share it here:
Leathers, Robert A., Trijntje V. Downes, Curtiss O. Davis, and Curtis D. Mobley. 2004.
Monte Carlo Radiative Transfer Simulations for Ocean Optics: A Practical Guide.
Ft. Belvoir: Defense Technical Information Center.
Excerpt from the Introduction:
"This report provides a methodology and the equations needed to generate Monte Carlo computer
simulations for many common ocean optics applications. These applications include the modeling of
natural ocean-atmosphere environments and analyses of laboratory and in-situ optical instrumentation.
We attempt to provide enough practical detail to make it straightforward for the reader to write his/her
own computer code for his/her own application. This document also serves as documentation of the
methods the authors have used in several specific research projects (e.g., [1]—[3])."
/eric