We examine the effects of chemisorbed organic molecules on the intensity versus beam energy (I/E) variation of the substrate (1x1) Bragg spots in low energy electron diffraction (LEED). We find that these integer-order spots alone can provide important information about the local geometries of the molecules on the surface, largely independent of the degree of long-range order of an adsorbate overlayer. This is demonstrated by comparing LEED studies of two different adsorbates on Pd(111), namely: C 2 H 2 which forms an ordered (3x3)R30 o overlayer, and thus gives rise to superstructure (or fractional-order) Bragg spots, and disordered CH 3 OH, which scatters diffusely into directions between the integer-order spots. This allows LEED to be used conveniently for the determination of the structures of adsorbates on surfaces as a continuous function of coverage, independent of the degree of long-range order of the adlayer.