What are ABAB... packing and ABCABC... packin | vedclass

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Question

(A) In $ABAB...$ type packing,the third layer is placed directly above the first layer,which results in a Hexagonal Close Packing $(hcp)$ structure.In

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Hexagonal Close Packing $(hcp)$ and Cubic Close Packing $(ccp)$

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(A) In $ABAB...$ type packing,the third layer is placed directly above the first layer,which results in a Hexagonal Close Packing $(hcp)$ structure.In $ABCABC...$ type packing,the fourth layer is placed directly above the first layer,which results in a Cubic Close Packing $(ccp)$ or Face-Centered Cubic $(fcc)$ structure.Therefore,$ABAB...$ is $hcp$ and $ABCABC...$ is $ccp$.

What are $ABAB...$ packing and $ABCABC...$ packing respectively called?

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