minecraft-assets/data/minecraft/recipes/weathered_cut_copper_slab_from_weathered_cut_copper_stonecutting.json

{
  "type": "minecraft:stonecutting",
  "count": 2,
  "ingredient": {
    "item": "minecraft:weathered_cut_copper"
  },
  "result": "minecraft:weathered_cut_copper_slab"
}