`-shear <n> <A> <s>`

This option applies simple shear strain to the system, by tilting an axis by a certain amount along a direction. The following values have to be provided:

**n:**normal to the plane of shear, it must be x, y or z.**A:**the amplitude of the tilt vector (in Å), or the shear (if the symbol % is used); it can be positive or negative.direction of the shear vector, must be x, y or z, and must be different from <n>.*s*:

For instance, if <n>=Y, <A>=0.1 Å, and <s>=X, then the Y axis is tilted along X by 0.1 Å, producing a shear strain ε_{YX}. The X coordinates of atoms are also sheared accordingly.

Considering the height of the supercell along the direction <n> is *h*, the angle θ by which the direction <n> is tilted is defined as: tan(θ) = <A>/*h*.

Note that if <n> = <s>, then it results in *normal strain* rather than shear strain. For normal strain you may consider using the option `-deform`

instead.

By default the system is not sheared.

`atomsk original.xsf -shear x 1.5 z final.xyz`

This will tilt the first supercell vector by 1.5 Å along Z.

`atomsk original.xsf -shear x 0.5% z final.xyz`

This will apply a shear ε

_{xz}=0.5% to the system.