  This paper describes the integration structures for the silicon strips
tracker of the ATLAS detector proposed for the Phase-II upgrade of the Large
Hadron Collider (LHC), also referred to as High Luminosity LHC (HL-LHC). In
this proposed detector Silicon strip sensors are arranged in highly modular
structures, called `staves' and `petals'. This paper presents performance
results from the latest prototype stave built at Berkeley. This new,
double-sided prototype is composed of a specialized core structure, in which a
shield-less bus tape is embedded in between carbon fiber lay-ups. A detailed
description of the prototype and its electrical performance are discussed in
detail.
