The aggregation process of Rhodamine 6G (R6G) laser dye intercalated in supported thin films of Laponite clay (Lap) is analyzed by means of electronic absorption spectroscopy. Two procedures are proposed to express the analytical dye concentration of the solid samples with respect to a reference-diluted dye film by means of a normalization-concentration factor. From the evolution of the concentration-normalized absorption spectra with the concentration factor, analyzed by means of a nonlinear least-squares fitting equation obtained from the mass law, the absorption characteristics and the aggregation constant of the dimer of R6G in Lap films were evaluated in moderate dye/clay loadings (1-25% of the total cation exchangeable capacity, CEC, of Lap clay). An oblique head-to-tail dimer was characterized by applying the exciton theory with an intermonomeric distance of around 9.5 Angstrom and a torsion angle between the long molecular axis units of around 105degrees. This dimer contrasts with the twisted sandwich-type dimer of R6G previously observed in Lap particles in aqueous suspensions, probably because the limitation of the interlayer space in solid samples does not allow sandwich-type aggregates with a parallel disposition of the aromatic ring into the clay surface. A higher-order aggregate of R6G is observed in high loading samples (>25% CEC).