Multilayer phase coherence is demonstrated in a mixed-morphology superlattice heterostructure, generalizing the paradigm for superlattice miniband engineering. Thirty years since the original proposal by Tsu, a superlattice has been realized with alternating amorphous ($a\text{−}{\mathrm{MoO}}_3$) and polycrystalline ($pc\text{−}{\mathrm{In}}_2{\mathrm{O}}_3$) layers, whose high quality exhibits quantum phase coherence across multiple periods of amorphous barriers. Cross-plane phase coherence is quantified via weak localization signatures in magnetic field under the diffusive Fermi-surface model.

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• Electrical conductivity
• Magnetotransport
• Quantum interference effects
• Weak localization
• Amorphous semiconductors
• Oxides
• Polycrystalline materials
• Superlattices