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However, the integration of FE perovskite oxides into miniaturized memory and gadgets has been hampered by the critical thickness restriction, as out-of-plane ferroelectricity in most FE perovskite oxides will recede when the oxide thin film width is below a critical value. On the other hand, CuInP2S6 (CIPS) nano-flake, a prototypical two-dimensional (2D) FE material, has recently already been demonstrated to display stable out-of-plane ferroelectricity during the a