Can ABA Arrangements Switch to ABC Arrangements in Crystals?

[MotoPayton]

When looking at the ABA and ABC arangments I was wondering if an ABA arrangement can switch to a ABC arrangement in the same crystal.

What would keep the spheres from randomly switching between these two patterns.

From what I understand the 3rd layer always has two options..

 

[sjb-2812]

Whilst the two arrangements probably have similar energy (from what I remember), there is probably an energy barrier between the two, a bit like the inversion of phosphines (or amines, except this is much lower)

 

[DrDu]

In many substances this swiching happens, e.g. SiC.