# gtensorof.m

Returns the g-tensor of the specified spin at the input orientation.

## Syntax

    g=gtensorof(spin_system,spin_number)


## Description

Zeeman interaction specifications at the input stage may vary a lot, but this function always returns the g-tensor in Bohr magneton units.

## Arguments

    spin_number - a positive integer specifying the number
of the spin in the sys.isotopes list


## Outputs

    g - a 3x3 matrix in Bohr magneton units


## Notes

The same convention (mu=-mu_b*g*S/hbar) is used for the nuclei, meaning that their g-tensors are much smaller than those of electrons.