Exodus 28:16
Foursquare it shall be being doubled; a span shall be the length thereof, and a span shall be the breadth thereof.
Torrey's Topical Textbook—AKJV

Exodus 39:9
It was foursquare; they made the breastplate double: a span was the length thereof, and a span the breadth thereof, being doubled.
Torrey's Topical Textbook—AKJV