I would like to make sure the roles of Micro-segmentation and Macro-segmentation in the business to business industry.

I believe macro-segmentation is a group of buying firm that is attracted differently to the supplier firm in terms of organisational size, geographical location, frequency of use.

And micro-segmentation is a group of each macro-segmentation that have different decision making factors such as the personal characters of decision making units and purchasing strategies.

So the micro segmentation would be run as a second step to dig deeper into the customer needs and wants if supplier cannot identify them distinctly at the macro-segmentation phase.

Is my understanding correct and would you give me some actual example of the firm uses micro-segmentation strategy?