Figure shows the snapshots selected from the ground-state Langevin trajectories. Azobenzene units experience much larger conformational freedom for SAM 5.5 Å (Figure ) than for SAM 3.5 Å (Figure ). The free tetramer 5.5 Å (Figure ) shows a similar spread of geometries to that of SAM 5.5 Å, whereas the free tetramer 3.5 Å (Figure ) demonstrates larger geometrical variability than SAM 3.5 Å but lesser than models with a = 5.5 Å.