1. **State the problem:** We need to find the diameter of a round clay mold given its radius. 2. **Recall the formula:** The diameter $d$ of a circle is twice the radius $r$. This is expressed as: $$d = 2r$$ 3. **Given:** The radius $r$ is 2 inches. 4. **Calculate the diameter:** Substitute $r = 2$ into the formula: $$d = 2 \times 2$$ 5. **Simplify:** $$d = 4$$ 6. **Answer:** The diameter of the mold is 4 inches.