Figure 3: Quasicrystalline Pb layers at different heights.

(a) STM image (300 Å × 300 Å) of the fivefold i-Ag-In-Yb surface after deposition of Pb for 90 min. Left inset: Fourier transform of the image. Right inset: a section of autocorrelation function of a 1,000 Å × 1,000 Å STM image (180 Å × 145 Å). A P1 tiling patch is overlaid, which is inflated by τ with respect to the tiling of the substrate or first layer. (b,c) STM images at the same coverage demonstrating the intermediate (b) and third layer (b: 300 Å × 300 Å; c: 270 Å × 150 Å) with quasicrystalline order. The white circles marked 3, 4 and 5 identify the second, intermediate and third layer features, respectively, discussed in the text.