Conjugated ladder molecules L1-PF6 and L2-PF6 exhibited two dominant conductance peaks with high and low conductance features (vide infra). For the high conductance peaks, the most probable or average conductance values for L1-PF6 and L2-PF6 were similar at 10 -2.9 G0 and 10 -3.2 G0, despite large differences in the end-to-end molecular contour length (12.5 Å for L1-PF6 and 18.0 Å for L2-PF6 determined by DFT calculations, Supplementary Tables ). Remarkably, the attenuation factor for L1-PF6 and L2-PF6 (defined as the change in molecular conductance G/G0 with respect to contour length) was only 0.12 Å -1 , which is among one of the smallest conductance decays reported in literature and significantly smaller than previously reported values for oligo[n]phenylenes and oligothiophenes (0.44 Å -1 and 0.40 Å -1 , respectively).