We present a comprehensive analysis of magnetotransport across monolayer $1T^{\prime }\text{−}{\mathrm{WTe}}_2$, highlighting the role of nonsymmorphic symmetries in governing edge-state spin behavior. By comparing the electronic transmission in nanoribbons with edges along the crystallographic $\widehat{y}$ and $\widehat{x}$ directions, our analysis reveals a pronounced anisotropy in the magnetic-field response. The $\widehat{y}$-edge ribbon exhibits significant spin splitting of the edge-state bands in both energy and momentum space, together with a strong angular dependence of the conductance. The observed magnetotransport response indicates a spin quantization axis that aligns with the out-of-plane spin quantization axis reported in previous experimental studies. In contrast, the $\widehat{x}$-edge ribbon shows negligible spin splitting with magnetic fields, which is attributed to nonsymmorphic symmetries such as glide mirror and screw rotation, which protects degeneracies along the $\mathrm{\Gamma }\text{−}X$ direction, even when time-reversal symmetry is broken. The energy-resolved current density and angular transmission analysis confirm that this anisotropy originates from edge states, while bulk states remain largely insensitive to the field orientation. Our results establish direct transport spectroscopy based evidence of nonsymmorphic symmetry-protected spin degeneracy in $1T^{\prime }\text{−}{\mathrm{WTe}}_2$, and underscore its promise for spintronic devices that leverage symmetry-protected and directionally selective transport channels.

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• Crystal symmetry
• Magnetic anisotropy
• Quantum transport
• Spin-orbit coupling
• Spintronics
• Transition metal dichalcogenides
• Magnetotransport