M. AL- Maula, T. 2025. The Effect of Humidity on the Optical Storage BDK/MR and PMMA/BDK/MR Systems Using the Spectroscopic Eillpsometry. Rafidain Journal of Science. 20, 5 (Jun. 2025), 95–102. DOI:https://doi.org/10.33899/rjs.2009.40078.