"slots": {
  "rect2_rotate": {
    "p": {
      "a": 0,
      "x": "var $bm_rt;\nvar rect1 = thisComp.layer('Rectangle 1');\nvar rect2 = thisComp.layer('Rectangle 2');\nvar rect1Pos = rect1.transform.position.value;\nvar rect2Pos = rect2.transform.position.value;\nvar dx = rect1Pos[0] - rect2Pos[0];\nvar dy = rect1Pos[1] - rect2Pos[1];\n$bm_rt = Math.atan2(dy, dx) * 180 / Math.PI;"
    }
  }
}