When plates divide or separate it is called

tend to split apart along bands

Explanation:

Foliated rocks are metamorphic rocks that are formed due to high pressure and heat leads to the layered or banded appearance of the rocks.

Due to the layered or banded appearance of the rocks, foliated rocks tend to split apart along bands  that are aligned parallel to the minerals in the rocks. Example of foliated rocks: Slate, that split into thin sheets along bands .

Hence, the correct answer is "tend to split apart along bands ".