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We report on detailed and systematic experiments of thin liquid films flowing as a result of the action of gravity under an inverted planar substrate. A measurement technique based on planar laser-induced fluorescence (PLIF) was developed and applied to a range of such flows in order to provide detailed space- and time-resolved film-height information. Specifically, the experimental campaign spanned three inclination angles (, , and , in all cases negative with respect to the vertical), two water-glycerol solutions (with Kapitza numbers of and 330), and flow Reynolds numbers covering the range . The collection optics were arranged so as to interrogate a spanwise section of the flow extending about symmetrically on either side the centerline of the film span ( in total), at a distance 330 mm downstream of the flow inlet. A range of flow regimes, typically characterized by strong three dimensionality …