function getMark( 
   zIndex : number(Integer)
) : Mark;

var resultVar = instanceOfArtPage.getMark(number(Integer));

Parameters

zIndex

The zero-based Z-index of the mark to return.

Return Value

This function returns the mark at the specified Z-index. The getZIndexOfMark function performs the opposite operation. The mark at Z-index 0 is the bottom-most mark in the Z-order.

Reference