For tunneling junctions, we expect J = J 0 exp(-βn), where J 0 is a pre-exponential factor which is often associated with the contact resistance, β is the decay parameter, and n is the number of carbon atoms in the molecule. Experimentally, we found that 〈log 10 |J(-5V )|〉 G exhibits an exponential decay with increasing molecular length (Fig. ), with the experimentally determined β = 1.01 ± 0.04 n -1 consistent with previously reported values for tunnel junctions with n-alkanethiolate SAMs. Despite having a smooth EGaIn droplet, the value of the pre-expontential factor log 10 |J 0 | = 1.7 ± 0.1 (where