The rational combination of existing magnetic topological compounds presents a promising route for designing topological materials. We report the synthesis and comprehensive characterization of the layered quaternary intergrowth compound ${\mathrm{Eu}}_2{\mathrm{CuZn}}_2{\mathrm{As}}_3$, which combines structural units of two known magnetic topological materials, EuCuAs and ${\mathrm{EuZn}}_2{\mathrm{As}}_2$. ${\mathrm{Eu}}_2{\mathrm{CuZn}}_2{\mathrm{As}}_3$ exhibits an antiferromagnetic ground state with successive magnetic transitions: quasi-two-dimensional ordering at $T_{\mathrm{M}}=29.3\mathrm{K}$, long-range antiferromagnetic ordering at $T_{\mathrm{N}}=19\mathrm{K}$, and spin reorientation at $T_{\mathrm{SR}}=16.3\mathrm{K}$. The stepwise magnetic transitions manifest as plateaulike anomalies in the heat capacity. These transitions originate from multiple superexchange pathways and periodic variation of interplane Eu-Eu distances in the intergrowth structure. Charge transport shows a pronounced resistivity increase above $T_{\mathrm{N}}$ followed by minimal change below the ordering temperature. Magnetic fields rapidly suppress this resistivity rise, yielding significant negative magnetoresistance. Remarkably, ${\mathrm{Eu}}_2{\mathrm{CuZn}}_2{\mathrm{As}}_3$ inherits the nonlinear anomalous Hall effect characteristic of its parent compounds. Energy evaluations of collinear spin configurations reveal a lowest-energy state with ferromagnetic coupling between Eu planes in EuCuAs units while maintaining antiferromagnetic coupling within ${\mathrm{EuZn}}_2{\mathrm{As}}_2$ units. The corresponding electronic structure displays potentially topologically nontrivial features. Our work demonstrates the efficacy of structural hybridization for discovering alternative magnetic topological materials and establishes a general strategy for materials discovery.

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• Antiferromagnetism
• Magnetic phase transitions
• Magnetotransport
• Topological materials
• Triangular lattice
• Crystal growth