The larger metal-surface interaction for Co compared to Cu means that the metal atoms are more stable bound to the surface which limits the upwards migration and island formation In particular the stronger metal-substrate interaction compared to the metal-metal interaction appears to limit how many layers The effect of temperature on the morphology of the three metal clusters is then investigated by aiMD simulations at 400 and 800 K, in addition to the initial simulation at 600 K. For Cu there was a noticeable difference in the mobility of the atoms at over the temperature range. At the 400 K the atoms in the cluster were less mobile than at 600 K, Figure . The initial upwards migration of atoms for the Cu cluster was lower, with only 4 atoms migrating upwards during the first 1.5 ps. One additional Cu atom diffuses to the 2 nd layer at 3 ps, however this atom stays only at the layer for 3 more ps until is diffuses back to the lower layer. No atoms migrated to the 3 rd layer during the full 15 ps simulation. After this the layers stabilizes, with just one more unsuccessful upwards migration at ca 11 ps. In contrast the Cu atoms were significantly more mobile at 800 K, Figure . Vertical migration between the 1 st and 2 nd layer is clear during the full 15 ps simulation, with atoms both migrating upwards and downwards. In addition, the migration of an atom to the 3 rd layer occurs already at 1.5 -2ps, much earlier than at 600 K (ca 10 ps). The lateral movement of the atoms were also much higher at 800 K compared to 600 and 400 K with the atoms along the edges shifting around. The mobility of the atoms in the Co cluster also changed over the investigated temperature range. At 400 K, Figure , atom migration was slow, the diffusion from the 1 st to the 2 nd layer did not halt until ca 12 ps, compared to 600 K where it halted at ca 8 ps. Two Co atoms also move towards the 3 rd layer during the final 3 ps of the simulation as the low temperature causes them to have insufficient energy to overcome the barrier to diffuse down. At 800 K, the Co atoms show more migration, Figure , similar to the Cu atoms at 800 K. Migration of atoms between the 1 st and Ru follows in a similar trend, but with much less atomic movement compared to Cu or Co. At 400 K the Ru cluster remain fully 2D with all atoms bound to the substrate during the full 15 ps, Figure .