Table 1.

Relative magnitudes of Raman tensor elements (normalised to α′_xx) of the 1628-cm⁻¹ MB band for different angles φ.

φ	90°	0°	270°	180°
α′xx	1	1	1	1
α′xy	0.81	0.84	0.80	0.85	$a$
α′xz	0.06	0.10	0.08	0.04
α′yx	0.80	0.89	0.81	0.91	$b$
α′zx	0.18	0.12	0.17	0.12
α′yy	0.91	0.97	0.90	0.92	$c$
α′zz	0.01	0.05	0.01	0.06
α′yz	0.01	0.09	0.01	0.01
α′zy	0.24	0.16	0.23	0.16

The values were obtained by fitting the SERS depolarization ratios using the surface selection rules. Values revealed by the fit of ρ ₁ are labelled as a, by ρ ₂ as b and by ρ ₃ as c.