Verified Answer :

in 1 millimeter, there are 0.00109361
So in 2 mm, there are 2 × 0.00109361 = 0.00218722 yards

or do proportions:
\(\frac{1mm}{0.00109361yd}\) = \(\frac{2}{y}\)

Cross multiply:

2 × 0.00109361 = y
0.00218711 = y 

0.00218722 yards are in 2 millimeters.