Table 2. The elastic coefficients (C₁₁, C₁₂, and C₆₆), Young's modulus Y_2D, Poisson's ratio ν and piezoelectric coefficients e₁₁, e₃₁, d₁₁ and d₃₁ of InSeX (X = Cl, Br, and I) monolayers.

	C 11	C 12	C 66	Y 2D	ν	e 11	e 31	d 11	d 31
	N m−1	N m−1	N m−1	N m−1		10−10 C m−1	10−10 C m−1	(pm V−1)	(pm V−1)
InSeCl	31.50	9.38	11.05	28.69	0.30	5.60	0.02	33.50	0.86
InSeBr	33.18	9.88	11.65	30.24	0.30	3.68	0.10	19.10	0.54
InSeI	36.77	11.07	12.85	33.44	0.30	3.34	0.61	14.90	0.21