Can ABA Arrangements Switch to ABC Arrangements in Crystals?

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The discussion centers on the possibility of an ABA arrangement transitioning to an ABC arrangement within the same crystal structure. Key points include the consideration of energy barriers that may prevent random switching between these two patterns. It is noted that the third layer in these arrangements typically has two options, suggesting a degree of flexibility. While both arrangements may have similar energy levels, the presence of an energy barrier is emphasized, akin to the inversion seen in phosphines or amines, though at a lower energy level. The phenomenon of switching between arrangements is observed in various substances, including silicon carbide (SiC).
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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..
 
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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)
 
In many substances this swiching happens, e.g. SiC.
 

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