There are two possible structures for a square planar molecule with the formula AX2Y2.

Here's why:

* Square planar geometry means the central atom (A) is surrounded by four ligands in a square shape.

* AX2Y2 means there are two identical ligands (X) and two other identical ligands (Y) attached to the central atom.

Let's visualize the possibilities:

1. Cis isomer: The two Y ligands are adjacent to each other.

2. Trans isomer: The two Y ligands are opposite each other.

You can see these isomers visually here:

[Diagram of cis and trans isomers of AX2Y2]

Let me know if you would like more information about square planar geometry or isomerism!