Why there isn't a `3R` kind provided in the `ase.build.mx2`?

ASE
1

It’s well known that crystalline MoS2 has three phases, 1T-MoS2, 2H-MoS2, and 3R-MoS2 as described here, here, and here.

But I noticed that the following function ase.build.mx2 only has the two options for its parameter kind: {‘2H’ , ‘1T’}, as described in ASE’s official document.

So, I wonder why there isn’t a 3R kind provided in the ase.build.mx2?

Regards,
Zhao