Adjacent means side-by-side. What's the word for behind-one-another?

Example: rows 9 and 10 in the theatre are ??? rows.

Alternatively: rows 9 an 10 are ???-ly adjacent (while seats B and C are laterally adjacent).

There are words like subsequent, consecutive, etc., which have a somewhat temporal flavour, or at the very least hint at a sequential context (both are cognates of sequor, after all). But what's a good word choice for a strictly spatial context: an object behind/in front of another?

Clarification: I am a quasi-native speaker specifically curious as to why such a word seems so elusive, and equally as interested whether such a word exists in other languages. If there's no such thing, I'll accept that as an answer too.

Solution 1:

I would say the rows are stacked or ordered front to back.

Solution 2:

If this were a spreadsheet, you'd refer to that direction as columns as opposed to rows.

If you are talking about a theatre row, then you would just say the row behind.

If you are speaking of people, then you could use in line, or in a column to describe this positioning.

Solution 3:

I believe one could describe the position of theatre seats behind and in front of a row as being parallel.

I found a math problem which uses exactly this expression

The seats in a theater are arranged in parallel rows that form a rectangular region. The number of seats in each row of the theater is 16 fewer than the number of rows. How many seats are in each row of a theater that has 1,161 seats

And if you click on the link you'll see an image of parallel rows of trees.