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A model of rods with heads of variable size, which are confined to a planarsurface, is used to study the influence of the head group size on tilted phasesin Langmuir monolayers. Simple free energy considerations as well as exact zerotemperature calculations indicate that molecules with small head groups tilttowards next nearest neighbors, and molecules with larger head groups towardsnearest neighbors. This provides a possible explanation for recent experimentalresults, and for details of the generic phase diagram for fatty acidmonolayers.Comment: to appear in J. Chem. Phy

Influence of the head group size on the direction of tilt in Langmuir monolayers