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We study the $\hat{c}$ axis transport of WTe _2 . An enhancement of quantum oscillations allows for observation of an astonishing spin zero effect at certain field orientations for both hole bands and electron bands, providing transport evidence for their spin–orbit splitting origin. Based on the requirements for the spin zero effect, a lower limit for the Landé g -factor, as large as 44.7, has been obtained at a field angle of 63.7° with respect to the c axis towards the b axis for the hole band. The field dependence of the band splitting is experimentally determined.