Figure 2: Surface crystal structure representation consisting of four atomic layers (ALs) (AL1: Al(1)O(1a)O(1b), AL2: La(2)O(2), AL3: Al(3)O(3a)O(3b), AL4: La(4)O(4)) that were allowed to relax on top of the ideal bulk structure where the surface starts at z = 0.
From: Understanding surface structure and chemistry of single crystal lanthanum aluminate
Positive displacement in z (Δz) represents the outward displacement towards the vacuum.
