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A three-dimensional metallodielectric photonic crystal (MDPC) that utilizes planar metal scattering elements in a dielectric medium has been studied in the microwave regime, both experimentally and theoretically. The metal elements are circular copper patches defined on thin dielectric sheets, which are alternately stacked with thicker polyethylene sheets to form a (111)-oriented face-centered-cubic lattice. A photonic stop band has been measured from this “flat-atom” MDPC at 8.4 GHz with a rejection level of 18 dB per lattice period and a width of 50% of the center frequency. Calculations show excellent agreement with measured stop band characteristics, including a similar angular dependence and insensitivity to interplane registration.