Border for specific cell with latex/pdf output

[somelinguist]

Hi,

Is there a way to specify that a specific cell have a border?

Use case: I have a table with two header rows, and the first header row has a cell that spans two cells. I'd like to put a border/rule just below the cell spanning two columns. Something that would look like this:

For HTML output, it's sufficient just to put []{colspan=2 style="border-bottom: 1px"} at the beginning of the list item for the cell. But for latex, it gets stripped since it doesn't support CSS.

Is there any way to accomplish this?

Thanks!