2D Look at

Apply this Expression to the Rotation channel of any layer you wish to control.

After Effects 7
Camera
Expressions

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Set LookAt, below, to the name of the layer you wish the layer to look at. If the controlled layer is not
initially pointing straight up, enter an offset amount in degrees, below, to adjust the direction
it is looking.
by Fred Lewis

LookAt = "ball"
offset = 0
diffx = position[0] - this_comp.layer(LookAt).position[0];
diffy = position[1] - this_comp.layer(LookAt).position[1];
if (diffx == 0) {
diffx = 1 }
sign = 1 + (-1 * (diffx / Math.abs(diffx))) * 90;
radians_to_degrees(Math.atan(diffy/diffx)) + sign + offset

(Min. Version: After Effects 7, Category: Camera, Type: Expressions)