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FTIR-ATR dichroic ratios with and without a rotation of the ATR plates were measured for calcium or cadmium or lead stearate LB monomolecular films on germanium, hydrophilic silicon, and hydrophobic silicon plates. Various models for uniaxial or biaxial orientations of chain axes and transition moments are presented and critically evaluated. A biaxial orientation distribution was observed for calcium stearate. The average tilt and azimuthal angles of the chain axes were found to be 36O and 42O,doi:10.1021/j100203a068 fatcat:7gmk557v2rdvvffn34xyhdwfim