Fig. 3
STM images of the 9 ML Au film grown on Ru(0001) at RT and annealed at 1050 K during 5 min: a field of view 86 nm × 86 nm, sample bias voltage: U = − 0.003 V, tunneling current: I = 10 nA. b FFT transform of the image (a) shown is a square section of the reciprocal space with a side of 1 nm−1, the 0th order spot is exactly in the middle. c Cross-section along the white dashed line in a. d Field of view 17 nm × 17 nm, sample bias voltage − 0.003 V, tunneling current 50 nA; white arrows designate the primitive translation vectors of the surface superstructure. e, f Cross-sections along the dashed lines 1 and 2 in d. An individual gray scale (height-to-color correspondence) is given to the right of images a and d. 4.6 nm bars are given as black solid lines on the graphs in c, e, f