[Les]

No spreading in my die.
All are top surface sources and Waterloo based.
Incoherent is looking at bottom die sources.
Preliminarily work does not immediately support but is early days
Monitoring progress with Waterloo
It is hard going.
Direction and extent of work very uncertain.
May be most productive to concentrate on thermal-geometries for which data is/maybe available - Fluxbloc.

It is a mess.
However, not unhappy that slotted IHS is correct for determining pecking order of heatsinks.
Whether the performance of a heatsink is critical in thermal design is another matter