Defining the direction of step and repeat elements

Head to Foot / Foot to Head

Starting with the first element in the step-and-repeat spread,
the rows of elements are laid out with  the head of the element as defined,
opposite the foot of the element of the subsequent rows of elements.

Head to Head / Foot to Foot

Starting with the first element in the step-and-repeat spread,
the rows of elements are laid out with the head of the element as defined,
opposite the head of the element of the next rows of elements.