The translation from area per molecule to hard-disk area requires the disk packing efficiency to be estimated. The packing efficiency would be 0.906 for hexagonal packing (hp) or 0.785 for square packing (sp). The packing efficiency of the OFMs is likely to be tighter if there are stronger interactions between them (e.g. hydrogen bonds or van der Waals interactions between tailgroups). A summary of all the values for the area per molecule and the effective hard-disk area per molecule can be found in Table . As hexagonal packing is the most efficient way to pack disks on a surface, it is reasonable to assume at most a ratio of 0.906 between the raw area per molecule and the hard-disk area. Consequently, the results of the annealing simulations assuming hexagonal packing (A hp in Table ) are then used as input for the MTT model. The values in Table are in good agreement with those available in the literature for similar molecules. Interestingly, the estimated hard-disk area for both GMO and GMS is very similar. This is in contrast with studies from Wood et al., who measured a lower surface coverage for unsaturated OFMs with respect to their saturated counterparts.