This PDF file includes:

• Fig. S1. X-ray diffraction spectrum of In₂Se₃ flakes.
• Fig. S2. Air stability of In₂Se₃ and domains.
• Fig. S3. Image contrast of domains under a tilted electron beam in LEEM.
• Fig. S4. The control of electron beam tilt in LEEM.
• Fig. S5. Tilt angle–dependent domain contrast.
• Fig. S6. Proposed ferroelectric polarizations.
• Fig. S7. TEM measurements.
• Fig. S8. Ferroelectric polarization calculated using Berry phase method.
• References (40–47)

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