Rhodamine-6G organic films for optical limits: structural analysis, surface morphology, linear and nonlinear optical characteristicsE. F. M. El-Zaidia, A. A. A. Darwish and I. S. YahiaEur. Phys. J. Plus, 136 4 (2021) 422DOI: https://doi.org/10.1140/epjp/s13360-021-01415-x