A package includes a plurality of bonded substrates including a first substrate and a second substrate defining a cavity therebetween. The planar films and substrates are: {10 11} gallium nitride grown on a {100} spinel substrate miscut in specific directions, {10 13 } gallium nitride grown on a {110} spinel substrate, {11 22} gallium nitride grown on a {1 100} sapphire substrate, and {10 13} gallium nitride grown on a {1 100} sapphire substrate. At least one electrical property of the wafer can be determined from the measured response and the applied electrical stimulus. The downlink resources used for the data transmission are associated with ACK resources used to send ACK information for the data transmission. The extracted matter and the medium can proceed to further processing such as water purification andor petroleum refining.