Figure 4: Theoretical modelling, anisotropic and disorder media.

(a) Normalized resistivity versus length of the sample (in units of Λ) for different values of anisotropy as computed in the 3D resistor model. Black arrows correspond to the EMT result. All the transport regimes described in the main text are depicted in this graph; for small lengths, the resistivity (and resistance) depends exponentially on the sample length, and for larger lengths, it saturates to the value predicted by Effective Medium Theory. The figure also illustrates the importance of high anisotropy in the observation of the different regimes depending on the measured length scale. For the more anisotropic samples, the exponential dependence can be observed for larger lengths. (b) Schematic view of the structure of a MMX crystal showing the polymeric chains and a random distribution of defects (lighter regions).