Temperature-dependent differences in the structure of a cysteine layer were however reported previously. Adsorption of cysteine in UHV onto Au(111) at room temperature led to a heterogenous layer, with both weakly and strongly bound molecules, but adsorption at 330 K led to a uniform layer of chemisorbed molecules instead . This proves that even relatively small differences in the temperature can lead to changes in the stability of the monolayer.