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Sketch of the model used to derive SAM stiffness from QM results on the single molecule. (a) A is the probe area, N is the number of compressed molecules that occupy the area A; (b) schematic representation of the geometrical parameters of the QM model: d0 is the molecule length, b0 is the S–Au bond length, θ0 is the tilt angle, and l0 is the SAM thickness.
