All procedures for the measurement of electrical conductivity were carried out in glove boxes filled with high-purity Ar (99.999%). To measure the electrical properties of 2D-LiZnSb and 3D-ZnSb, electrical contacts in the six-point probe configuration were made with silver epoxy. Then, Apiezon N grease was coated onto the sample surfaces to prevent oxidation of samples during measurements. For 2D-ZnSb, we adopted the stamp method, where the 2D-ZnSb was cleaved by 3M Scotch tape and the exfoliated crystal was pressed with 3M Scotch tape onto the patterned electrodes on a SiO2/Si wafer. The transferred sample was then pressed with a copper plate and firmly fixed.

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