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The structure of decagonal Al 65 Cu 20 Co 15 , which was determined by single crystal X-ray diffraction method (Steurer, Kuo, 1990a, b), has been re-examined. By eliminating the weak peaks in the electron density maps, which are likely only artifacts in the Fourier transformation, we propose an ideal model of decagonal Al 65 Cu 20 Co 15 . The structure is composed of two quasiperiodic layers stacked periodically along the unique tenfold axis. These layers can be characterized as two-color Penrose tiling and the 10 5  screw axis is achieved by consecutive stacking two layers with 36° rotation between them. Therefore the structure of decagonal Al 65 Cu 20 Co 15  is assumed to be associated with a color quasilattice.

Color quasilattice in decagonal Al 65 Cu 20 Co 15 phase