Step front instability

Timelapse movie of average subtracted RICM images of corner of a 700 X 700 \(\mu\)m² large crystal with supersaturation \(\sigma=0.053\) and \(\bar{\zeta}=22\) nm. The dark areas correspond to a smaller distance to the confining glass and thus to the newly formed single molecular layer 0.33 nm thick, showing instabilities at the front. The four instable fronts propagate in the fast direction and display fingers that do not cover the entire surface move at constant velocity while a slow (and slowing down), diffusion controlled front fills the layer between the fingers. Some images from this movie are shown in Figs. 4 and S5.