What Is An Antonym For Layer?

The word layer has a number of meanings depending on various context. It is used for a a person or thing that lays. It is also used for an object which is laid. It is also used for a shoot or twig of a plant which is not detached from the stock but is laid under ground for propagation.

However, according to the most common use of the word layer. Its antonym is the word "Tier".