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We report an investigation of the combined structural and electronicproperties of the bronze Na$_{1.5}$(PO$_{2}$)$_{4}$(WO$_{3}$)$_{20}$. Its lowdimensional structure and possible large reconstruction of the Fermi surfacedue to charge density wave instability makes this bulk material a naturalsuperlattice with a reduced number of carriers and Fermi energy. Signatures ofmultilayered 2D electron weak localization are consequently reported, with anenhanced influence of quantum oscillations. A crossover between these twoantagonistic entities previously observed only in genuine low dimensionalmaterials and devices, is shown to occur in a bulk crystal due to its hidden 2Dnature.

Weak localization competes with the quantum oscillations in a natural electronic superlattice: the case of Na$_{1.5}$(PO$_2$)$_4$(WO$_3$)$_{20}$