Fig. 2

Experimental data. a X-ray diffraction pattern of the sample (see inset) evidencing the crystalline orientation of the Au and Ni nanolayers. Colored lines visualize transient shifts of the Bragg peaks at selected times. Their full time evolution is shown in panels (b) for Au and c for Ni along with the respective peak center positions (black line). The white dashed line indicates the axis break from linear to logarithmic time scale