Edge Layout
The linear column positioned at the edge of the shank rather than its midline, for an incremental gain in spike amplitude.
A linear layout, moved to the boundary of the substrate. Site spacing and the reasoning behind it are unchanged — sites remain evenly spaced along the shank. What differs is placement across the shank's width: the column runs along the edge instead of the centre line.
What it buys is an incremental gain in spike amplitude. Moving the sites to the edge of the substrate puts them at the boundary of the shank rather than on its face. The gain is incremental rather than transformative — it does not change what the layout is for, and the spacing argument is still the linear one — but on a design where unit amplitude is marginal it is the reason to choose the edge variant over Linear.
The Buzsaki layout is a variant of Edge. It staggers sites near the edges of the tip segment of a shank — closely spaced, and concentrated where the shank sits rather than spread along the trajectory. That trades reach for unit isolation, which is the configuration that made the layout standard for densely packed structures.