“…This technique is an extremely useful tool in different cases of study, which concerns both the study of Gibbs 4 and Langmuir monolayers. 5 Thus, UV-Vis-RS has been used for studying the interactions of various soluble components in the aqueous subphase, such as drugs, 6,7 proteins [8][9][10] and polyelectrolytes, [11][12][13] with ordered lipid Langmuir monolayers. Additionally, the study of ionic interactions, [14][15][16][17][18] molecular recognition, [19][20][21][22] and inclusion complex formation, 23 and analysis of phenomena such as photochromic, [24][25][26] photoisomerization, [27][28][29][30][31][32][33] charge and energy transfer, [34][35][36][37][38][39] and photoinduced electron-transfer [40][41][42][43] at the air-liquid interface have greatly benefited from the use of UV-Vis-RS.…”