# Why is the thermal resistance of copper shown higher than FR4 in below snap?

I see similar W and L for both Cu and FR4.

Why is the Cu thermal resistance shown higher than FR4? Is it because of Ounz difference?

1 Oz Copper= 34.8um. FR4 seems to have more thickness-> How would it reduce the thermal resistnce?

Could be a typo. I have calculated it as $$\8.7\cdot10^{-4} K/W\$$.