We study diffusive magnetotransport in highly $p$-doped large-area twisted bilayer graphene in $1^{\circ }$, $7^{\circ }$, $9^{\circ }$, and ${20}^{\circ }$ samples. All samples exhibit weak localization, from which we extract the phase coherence length and intervalley scattering lengths, and from that determine that dephasing is caused by electron-electron scattering and intervalley scattering is caused by point defects. We observe signatures of universal conductance fluctuations in the $9^{\circ }$ sample, which has high mobility and is near the van Hove singularity. Further improvements in sample quality and applications to large-area moiré materials will open new avenues to observe quantum interference effects.

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• Doping effects
• Electrical conductivity
• Magnetotransport
• Quantum interference effects
• Transport phenomena
• Weak localization
• Twisted bilayer graphene
• Drude model
• Resistivity measurements
• Tight-binding model
• Transport techniques