  Modeling of electron transport through organic molecules is presented in
order to interpret the experimental data of Rosink et al. [PRB 62, 10459
(2000)]. Such results are understand as coherent off-resonance tunneling
through the junction composed of molecular wires weakly coupled to the
electrodes (Au-substrate and STM-tip, respectively). The influence of physical
conditions on the characteristic parameters of the model is discussed in
detail.
