Two-dimensional (2D) magnetic materials are attracting significant interest due to their potential for exotic spin-dependent transport phenomena and spintronic applications. $\mathrm{FeP}{\mathrm{d}}_2\mathrm{T}{\mathrm{e}}_2$ is a layered ferromagnet with quasi-1D zigzag Fe chains and features intrinsic crystal twinning. Combining angle-dependent magnetotransport, magneto-optical Kerr effect imaging, and theoretical calculations, we establish a twin-domain-induced linkage between microstructure and transport. This intrinsic twinning generates a pseudo-fourfold in-plane magnetic anisotropy. Angle-dependent magnetoresistance (AMR) measurements confirm the presence of fourfold-symmetry components in the ferromagnetic state, while magneto-optical Kerr microscopy directly visualizes orthogonal in-plane magnetic domains that correspond to the twin structure. First-principles calculations suggest the anomalous Hall effect originates from an intrinsic Berry curvature mechanism, driven by strong spin-orbit coupling. The twinning strongly suppresses the measured in-plane anomalous Hall conductivity relative to single-domain expectations, indicating structural twinning as an effective microstructural knob for tuning Berry-phase responses. These results reveal a clear structure–property relationship in a low-symmetry layered magnet and position $\mathrm{FeP}{\mathrm{d}}_2\mathrm{T}{\mathrm{e}}_2$ as a platform for domain-engineered control of anisotropic magnetotransport in layered and low-dimensional ferromagnets.

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• Anomalous Hall effect
• Magnetotransport
• Layered crystals
• Magnetic systems
• First-principles calculations
• Kerr effect
• Transport techniques